I've been doing them on the first and third Sundays of the month. Weekends are less busy for me, and Sunday is far enough away from Wednesday, on the weeks where ysabetwordsmith and I both make a Comfort Corner/Cuddle Party post.

It also keeps it spread out enough to not bombard people with them (I think) so participation is still good.

(And honestly, two weeks is a short enough time to wait for comfort if I'm having a shit day/week.)